[問題] iOS 9公測版降回iOS 8.4過程小問題
各位前輩好:)
嘗鮮iOS 9後想降回原先iOS 8.4
更新前有先備份過
想請問進DFU之後，"刷回iOS 8.4前"
有需要"再備份一次"嗎?
請各位幫忙解惑了
謝謝^_^
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